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GSM/GPRS Module

M85 Hardware Design

M85_Hardware_Design Confidential / Released 35 / 92

3.6. RTC Backup

The RTC (Real Time Clock) function is supported by M85 module. The RTC is designed to work with an
external 32.768KHZ crystal and an internal power supply. If VBAT voltage is not present, a backup power
supply such as a coin-cell battery (rechargeable or non-chargeable) or a super-cap can be used. The
VRTC pin is voltage input for RTC and a 1.5K resistor is integrated in the module for peak current limit.

The following figures show various sample circuits for RTC backup.

Module

RTC

Core

1.5K

VRTC

Non-chargeable

Backup Battery

Figure 14: RTC Supply from a Non-chargeable Battery

VRTC

Rechargeable

Backup Battery

Module

RTC

Core

1.5K

Figure 15: RTC Supply from a Rechargeable Battery

SLEEP mode

Use PWRKEY pin, or use
EMERG_OFF pin

Pull DTR down or
incoming call or SMS
or GPRS

Quectel

Confidential

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Summary of Contents for M85

Page 1: ...M85 Hardware Design GSM GPRS Module Series Rev M85_Hardware_Design_V1 0 Date 2013 07 17 www quectel com ...

Page 2: ...UPON CUSTOMERS REQUIREMENTS QUECTEL MAKES EVERY EFFORT TO ENSURE THE QUALITY OF THE INFORMATION IT MAKES AVAILABLE QUECTEL DOES NOT MAKE ANY WARRANTY AS TO THE INFORMATION CONTAINED HEREIN AND DOES NOT ACCEPT ANY LIABILITY FOR ANY INJURY LOSS OR DAMAGE OF ANY KIND INCURRED BY USE OF OR RELIANCE UPON THE INFORMATION ALL INFORMATION SUPPLIED HEREIN ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE COPYRIGH...

Page 3: ...GSM GPRS Module M85 Hardware Design M85_Hardware_Design Confidential Released 2 92 About the document History Revision Date Author Description 1 0 2012 07 17 Winter CHEN Initial Quectel Confidential ...

Page 4: ...sign For Power Supply 26 3 3 4 Monitor Power Supply 27 3 4 Power On and Down Scenarios 27 3 4 1 Power On 27 3 4 2 Power Down 29 3 4 2 1 Power Down Module Using the PWRKEY Pin 29 3 4 2 2 Power Down Module Using AT Command 30 3 4 2 3 Over voltage or Under voltage Automatic Shutdown 30 3 4 2 4 Emergency Shutdown Using EMERG_OFF Pin 31 3 4 3 Restart 32 3 5 Power Saving 33 3 5 1 Minimum Functionality M...

Page 5: ...ming 60 3 11 3 Reference Design 62 3 11 4 AT Command 62 3 12 ADC 63 3 13 Behaviors Of The RI 64 3 14 Network Status Indication 66 3 15 Operating Status Indication 66 4 Antenna Interface 68 4 1 RF Reference Design 68 4 2 RF Output Power 69 4 3 RF Receiving Sensitivity 69 4 4 Operating Frequencies 70 4 5 RF Cable Soldering 70 5 Electrical Reliability and Radio Characteristics 71 5 1 Absolute Maximum...

Page 6: ...Module M85 Hardware Design M85_Hardware_Design Confidential Released 5 92 7 3 Packaging 83 8 Appendix A Reference 85 9 Appendix B GPRS Coding Scheme 90 10 Appendix C GPRS Multi slot Class 92 Quectel Confidential ...

Page 7: ...ION OF THE SD CARD INTERFACE 57 TABLE 17 PIN DEFINITION FOR SD MMC 58 TABLE 18 PIN DEFINITION OF PCM INTERFACE 59 TABLE 19 CONFIGURATION 60 TABLE 20 QPCMON COMMAND DESCRIPTION 62 TABLE 21 QPCMVOL COMMAND DESCRIPTION 63 TABLE 22 PIN DEFINITION OF THE ADC 63 TABLE 23 CHARACTERISTICS OF THE ADC 63 TABLE 24 BEHAVIORS OF THE RI 64 TABLE 25 WORKING STATE OF THE NETLIGHT 66 TABLE 26 PIN DEFINITION OF THE...

Page 8: ...REFERENCE DESIGN FOR UART PORT WITH HARDWARE FLOW CONTROL 41 FIGURE 21 REFERENCE DESIGN FOR FIRMWARE UPGRADE 41 FIGURE 22 REFERENCE DESIGN FOR DEBUG PORT 42 FIGURE 23 REFERENCE DESIGN FOR AUXILIARY UART PORT 43 FIGURE 24 LEVEL MATCH DESIGN FOR 3 3V SYSTEM 43 FIGURE 25 LEVEL MATCH DESIGN FOR 5V SYSTEM 44 FIGURE 26 LEVEL MATCH DESIGN FOR RS 232 44 FIGURE 27 REFERENCE DESIGN FOR AIN1 AIN2 47 FIGURE 2...

Page 9: ...IGN FOR NETLIGHT 66 FIGURE 49 REFERENCE DESIGN FOR STATUS 67 FIGURE 50 REFERENCE DESIGN FOR RF 68 FIGURE 51 RF SOLDERING SAMPLE 70 FIGURE 52 M85 MODULE TOP AND SIDE DIMENSIONS UNIT MM 77 FIGURE 53 M85 MODULE BOTTOM DIMENSIONS UNIT MM 78 FIGURE 54 THE PAD DIMENSIONS UNIT MM 78 FIGURE 55 RECOMMENDED FOOTPRINT UNIT MM 79 FIGURE 56 TOP VIEW OF THE MODULE 80 FIGURE 57 BOTTOM VIEW OF THE MODULE 80 FIGUR...

Page 10: ... into all manuals supplied with the product If not so Quectel does not take on any liability for customer failure to comply with these precautions Full attention must be given to driving at all times in order to reduce the risk of an accident Using a mobie while driving even with a handsfree kit cause distraction and can lead to an accident You must comply with laws and regulations restrcting the ...

Page 11: ... area with adequate cellular signal strength Your cellular terminal or mobile contains a transmitter and receiver When it is ON it receives and transmits radio frequency energy RF interference can occur if it is used close to TV set radio computer or other electric equipment In locations with potencially explosive atmospheres obey all posted signs to turn off wireless devices such as your phone or...

Page 12: ...e Maintenance Control etc M85 is an SMD type module with LCC package which can be easily embedded into applications It provides abundant hardware interfaces like PCM and Dual SIM Card Interface Designed with power saving technique the current consumption of M85 is as low as 1 3 mA in SLEEP mode when DRX is 5 M85 is integrated with Internet service protocols such as TCP UDP FTP and PPP Extended AT ...

Page 13: ...CS 4 Support the protocols PAP Password Authentication Protocol usually used for PPP connections Internet service protocols TCP UDP FTP PPP HTTP NTP PING Support Packet Broadcast Control Channel PBCCH CSD transmission rates 2 4 4 8 9 6 14 4 kbps non transparent Support Unstructured Supplementary Service Data USSD SMS Text and PDU mode SMS storage SIM card SIM interface Support SIM card 1 8V 3V Aud...

Page 14: ...art Power management The Peripheral interface Power supply Turn on off interface Auxiliary Port Used for AT command Phonebook management Support phonebook types SM ME ON MC RC DC LD LA SIM Application Toolkit Support SAT class 3 GSM 11 14 Release 99 Real time clock Supported Physical characteristics Size 25 3 0 15 24 5 0 15 2 6 0 2mm Weight Approx 3 3g Firmware upgrade Firmware upgrade via UART Po...

Page 15: ... GPIO Serial Interfac e Memory Interface PCM Interface SIM1 Interface SIM2 Interface ADC RF_ANT VBAT PWRKEY EMERG_OFF VRTC UART SIM1 Interface SIM2 Interface Reset ESD PMU SD Interface Figure 1 Module functional diagram 2 4 Evaluation Board In order to help customer to develop applications with M85 Quectel supplies an evaluation board EVB RS 232 to USB cable power adapter earphone antenna and othe...

Page 16: ...rface The module adopts LCC package and has 83 pins The following chapters provide detailed descriptions about these pins below Power supply Power on down RTC Serial interfaces Audio interfaces Dual SIM interface SD interface PCM interface ADC 3 1 Pin Of Module 3 1 1 Pin Assignment Quectel Confidential ...

Page 17: ... 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 Top view RF SIM2 VBAT UART ADC0 RESERVED SPK2P AGND MIC2P MIC2N MIC1P MIC1N SPK1N SPK1P STATUS PCM_OUT PCM_SYNC RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED SD_CMD SD_CLK SD_DATA0 GND TXD_AUX RXD_AUX DBG_TXD DBG_R...

Page 18: ...CM_CLK 20 PCM_OUT 21 PCM_SYNC 22 RESERVED 23 RESERVED 24 RESERVED 25 RESERVED 26 RESERVED 27 RESERVED 28 RESERVED 29 RESERVED 30 RESERVED 31 RESERVED 32 RESERVED 33 RESERVED 34 SD_CMD 35 SD_CLK 36 SD_DATA0 37 GND 38 RESERVED 39 RESERVED 40 TXD_AUX 41 RXD_AUX 42 DBG_TXD 43 DBG_RXD 44 RESERVED 45 DCD 46 RI 47 DTR 48 CTS 49 TXD 50 RXD 51 RTS 52 SIM_GND 53 SIM1_RST 54 SIM1_DATA 55 SIM1_CLK 56 SIM1_VDD...

Page 19: ...f module VBAT 3 3V 4 6V Vmax 4 6V Vmin 3 3V Vnorm 4 0V Make sure that supply sufficient current in a transmitting burst typically rises to 1 6A VRTC 59 I O Power supply for RTC when VBAT is not supplied for the system Charging for backup battery or golden capacitor when the VBAT is applied VImax 3 3V VImin 1 5V VInorm 2 8V VOmax 2 85V VOmin 2 6V VOnorm 2 8V Iout max 1mA Iin 2 6 5 uA If unused keep...

Page 20: ...least 20ms which will turn off the module in case of emergency Use it only when shutdown via PWRKEY or AT command cannot be achieved VILmax 0 4V VIHmin 2 2V Vopenmax 2 8V EMERG_ OFF Module indicator PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT STATUS 16 O Indicate module s operating status Output high level when module turns on while output low level when module turns off VOHmin 0 85...

Page 21: ...h voice and ringtone output Network status indicator PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT NETLIGHT 4 O Network status indication VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT If unused keep this pin open UART Port PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT DTR 47 I Data terminal ready VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 3 VOHmin 0 85 V...

Page 22: ...eceive data Dual SIM interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT SIM1_VDD 56 O Power supply for SIM card The voltage can be selected by software automatically Either 1 8V or 3V All signals of SIM interface should be protected against ESD with a TVS diode array Maximum trace length is 200mm from the module pad to SIM card holder SIM2_VDD 71 SIM1_CLK 55 O SIM clock 3V VOLmax...

Page 23: ...p these pins open SIM_ GND 52 SIM ground ADC PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT ADC0 2 I General purpose analog to digital converter Voltage range 0V to 2 8V If unused keep this pin open PCM PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT PCM_CLK 19 O PCM clock VILmin 0V VILmax 0 25 VDD_EXT VIHmin 0 75 VDD_EXT VIHmax VDD_EXT 0 3 VOHmin 0 85 VDD_EXT VOLmax 0 15 VD...

Page 24: ... VDD_EXT 0 3 VOHmin 0 85 VDD_EXT VOLmax 0 15 VDD_EXT SD_ CLK 35 O SD clock SD_ DATA0 36 I O SD data RF interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT RF_ ANT 63 I O RF antenna pad Impedance of 50Ω Other interface PIN NAME PIN NO I O DESCRIPTION DC CHARACTERISTICS COMMENT RESER VED 1 3 22 33 38 39 44 58 75 78 83 Keep these pins open Mode Function Normal operation GSM GPRS Slee...

Page 25: ...ng Area where the module is located at GPRS READY The PDP context is active but no data transfer is ongoing The module is ready to receive or send GPRS data The SGSN knows the cell where the module is located at GPRS DATA There is GPRS data in transfer In this mode power consumption is decided by the PCL working RF band and GPRS multi slot configuration POWER DOWN Normal shutdown by sending the AT...

Page 26: ...drop during the transmit burst does not exceed 400mV Vdrop 4 615ms 577us IBAT VBAT Burst 1 6A Figure 3 Voltage Ripple during Transmitting 3 3 2 Decrease Supply Voltage Drop The power supply range of the module is 3 3V to 4 6V Make sure that the input voltage will never drop below 3 3V even in a transmitting burst If the power voltage drops below 3 3V the module could turn off automatically For bet...

Page 27: ...dule s power supply If there is a big voltage difference between the input source and the desired output VBAT a switcher power converter is recommended to use as a power supply Figure 5 shows a reference design for 5V input power source The designed output for the power supply is 4 16V and the maximum load current is 3A In addition in order to get a stable output voltage a zener diode is placed cl...

Page 28: ... by driving the pin PWRKEY to a low level voltage and after STATUS pin outputs a high level PWRKEY pin can be released Customer may monitor the level of the STATUS pin to judge whether the module is power on or not An open collector driver circuit is suggested to control the PWRKEY A simple reference circuit is illustrated as below Turn on pulse PWRKEY 4 7K 47K Figure 6 Turn on the Module with an ...

Page 29: ...cument 1 The other way to control the PWRKEY is through a button directly A TVS component is indispensable to be placed nearby the button for ESD protection For the best performance the TVS component must be placed nearby the button When pressing the key electrostatic strike may generate from finger A reference circuit is shown in the following figure PWRKEY S1 Close to S1 TVS Figure 7 Turn on the...

Page 30: ... power down procedure Turn off module using command AT QPOWD Over voltage or under voltage automatic shutdown Take effect when over voltage or under voltage is detected Emergent power down procedure Turn off module using the EMERG_OFF pin 3 4 2 1 Power Down Module Using the PWRKEY Pin It is a safe way to turn off the module by driving the PWRKEY to a low level voltage for a certain time The power ...

Page 31: ...evel voltage in this mode 3 4 2 2 Power Down Module Using AT Command It is also a safe way to turn off the module via AT command AT QPOWD 1 This command will let the module to log off from the network and allow the firmware to save important data before completely disconnecting the power supply Before the completion of the power down procedure the module sends out the result code shown below NORMA...

Page 32: ...orrectly synchronized after start up The module is recommended to set to a fixed baud rate After that moment no further AT commands can be executed The module logs off from network and enters power down mode and only RTC is still active The power down mode can also be indicated by the pin STATUS which is a low level voltage in this mode 3 4 2 4 Emergency Shutdown Using EMERG_OFF Pin The module can...

Page 33: ...age for a certain time which is similar to the way of turning on module Before restarting the module at least 500ms should be delayed after detecting the low level of STATUS The restart timing is illustrated as the following figure PWRKEY INPUT STATUS OUTPUT Delay 0 5s Turn off Restart Pull down the PWRKEY to turn on the module Figure 12 Timing of restarting system The module can also be restarted...

Page 34: ...an be minimized when the slow clocking mode is activated at the same time The mode is set with the AT CFUN command which provides the choice of the functionality levels fun 0 1 4 0 minimum functionality 1 full functionality default 4 disable both transmitting and receiving of RF part If the module is set to minimum functionality by AT CFUN 0 the RF function and SIM card function would be disabled ...

Page 35: ...ly In this mode the module can still receive voice SMS or GPRS paging from network but the UART port does not work 3 5 3 Wake Up Module From SLEEP Mode When the module is in the SLEEP mode the following methods can wake up the module If the DTR Pin is set low it would wake up the module from the SLEEP mode The UART port will be active within 20ms after DTR is changed to low level Receive a voice o...

Page 36: ...e or non chargeable or a super cap can be used The VRTC pin is voltage input for RTC and a 1 5K resistor is integrated in the module for peak current limit The following figures show various sample circuits for RTC backup Module RTC Core 1 5K VRTC Non chargeable Backup Battery Figure 14 RTC Supply from a Non chargeable Battery VRTC Rechargeable Backup Battery Module RTC Core 1 5K Figure 15 RTC Sup...

Page 37: ...le battery XH414H IV01E from Seiko Figure 17 Charging Characteristics of Seiko s XH414H IV01E 3 7 Serial Interfaces The module provides three serial ports UART Port Debug Port and Auxiliary UART Port The module is designed as a DCE Data Communication Equipment following the traditional DCE DTE Data Terminal Equipment connection Autobauding function supports baud rate from 4800bps to 115200bps The ...

Page 38: ...host AT command AT IFC 2 2 is used to enable hardware flow control AT command AT IFC 0 0 is used to disable the hardware flow control For more details please refer to the document 1 The Debug Port DBG_TXD Send data to the COM port of computer DBG_RXD Receive data from the COM port of computer The Auxiliary UART Port TXD_AUX Send data to the RXD of DTE RXD_AUX Receive data from the TXD of DTE The l...

Page 39: ...bles hardware flow control by default AT command AT IFC 2 2 is used to enable hardware flow control After setting a fixed baud rate or autobauding please send AT string at that rate The UART port is ready when it responds OK Autobauding allows the module to detect the baud rate by receiving the string AT or at from the host or PC automatically which gives module flexibility without considering whi...

Page 40: ...autobauding enabled and not be synchronized Any other Unsolicited Result Codes will be sent at the previous baud rate before the module detects the new baud rate by receiving the first AT or at string The DTE may receive unknown characters after switching to new baud rate It is not recommended to switch to autobauding from a fixed baud rate If autobauding is active it is not recommended to switch ...

Page 41: ...rt GND GND PC DTE Figure 18 Reference Design for Full Function UART Three line connection is shown as below TXD RXD GND UART port RTS 0R TXD RXD GND Module DCE Host DTE Controller Figure 19 Reference Design for UART Port UART Port with hardware flow control is shown as below This connection will enhance the reliability of the mass data communication Quectel Confidential ...

Page 42: ...ed to upgrade firmware The PWRKEY pin must be pulled down before firmware upgrade The reference circuit is shown as below IO Connector TXD RXD GND PWRKEY Module DCE UART port TXD RXD GND PWRKEY Figure 21 Reference Design for Firmware Upgrade The firmware of module might need to be upgraded due to certain reasons It is recommended to reserve these pins in the host board for firmware upgrade For det...

Page 43: ...eference Design for Debug Port 3 7 3 Auxiliary UART Port Auxiliary UART Port Two data lines TXD_AUX and RXD_AUX Auxiliary UART port is used for AT command only and does not support GPRS data CSD FAX Multiplexing function etc Auxiliary UART port supports the communication baud rates as the following 4800 9600 14400 19200 28800 38400 57600 115200 The default baud rate setting is 115200bps and does n...

Page 44: ...l TXD RXD 1K TXD RXD RTS CTS DTR RI RTS CTS GPIO EINT GPIO DCD Module 1K 1K Voltage level 3 3V 5 6K 5 6K 5 6K 1K 1K 1K 1K GND GND Figure 24 Level Match Design for 3 3V System The reference design for 5V level match is shown as below The connection of dotted line can be referred to the connection of solid line Please pay attention to the direction of signal Input dotted line of module should be ref...

Page 45: ...evel Match Design for 5V System The following circuit shows a reference design for the communication between module and PC Since the electrical level of module is 2 8V so a RS 232 level shifter must be used 9 8 7 6 5 4 3 2 1 15 14 8 9 11 12 5 7 6 10 4 26 2 27 13 18 20 21 16 17 19 22 23 24 3 1 25 28 GND TO PC serial port SP3238 3V GND GND T5OUT SHUTDOWN V GND V VCC T4OUT T2OUT T3OUT T1OUT R3IN R2IN...

Page 46: ...sh a pseudo differential mode AOUT3 is used for loud speaker output as it embedded an amplifier of class AB whose maximum drive power is 800mW All of these three audio channels support voice and ringtone output and so on and can be switched by AT QAUDCH command For more details please refer to the document 1 Interface Name Pin NO Description AIN1 AOUT1 MIC1P 9 Channel 1 Microphone positive input M...

Page 47: ...or largely depends on the material and production technique Therefore customer would have to discuss with its capacitor vendor to choose the most suitable capacitor for filtering out GSM850MHz GSM900MHz DCS1800MHz and PCS1900MHz separately The severity degree of the RF interference in the voice channel during GSM transmitting period largely depends on the application design In some cases GSM900 TD...

Page 48: ...o traces have to be placed according to the differential signal layout rule 3 8 2 Microphone Interfaces Design AIN1 and AIN2 channels come with internal bias supply for external electret microphone A reference circuit is shown in the following figure Close to Microphone MICxP MICxN Differential layout Module Electret Microphone GND 33pF 0603 33pF 0603 GND 10pF 0603 10pF 0603 ESD ESD 10pF 0603 33pF...

Page 49: ...ign SPK1P SPK1N Differential layout Module 10pF 0603 Close to speaker GND ESD 33pF 0603 33pF 0603 GND 10pF 0603 ESD 10pF 0603 33pF 0603 Figure 28 Reference Design for AOUT1 SPK2P AGND Differential layout 10pF 0603 33pF 0603 Close to Speaker GND ESD Module 22uF Figure 29 Handset Interface Design for AOUT2 Quectel Confidential ...

Page 50: ... s TPA6205A1is recommended for a suitable differential audio amplifier There are plenty of excellent audio amplifiers in the market 3 The value of C1 and C2 here depends on the input impedance of audio amplifier 3 8 4 Earphone Interface Design Amphenol 9001 8905 050 1 2 4 3 SPK2P MIC2N MIC2P 22uF 68R GND GND AGND Close to Socket Differential layout AGND GND GND GND GND AGND Module 4 7uF 33pF 0603 ...

Page 51: ... Loud Speaker Interface Design 3 8 6 Audio Characteristics Table 11 Typical Electret Microphone Characteristics Table 12 Typical Speaker Characteristics Parameter Min Typ Max Unit Working Voltage 1 2 1 5 2 0 V Working Current 200 500 uA External Microphone Load Resistance 2 2 k Ohm Parameter Min Typ Max Unit AOUT1 Output Single ended Load resistance 28 32 Ohm Ref level 0 2 4 Vpp Differential Load ...

Page 52: ... of the GSM Phase 1 specification and also supports the functionality of the new GSM Phase 2 specification for FAST 64 kbps SIM card which is intended for use with a SIM application Tool kit The SIM interface is powered by an internal regulator in the module Both 1 8V and 3 0V SIM Cards are supported Table 13 Pin Definition of the SIM Interface AOUT2 Output Single ended Load resistance 16 32 Load ...

Page 53: ...ection function For details about this AT command please refer to the document 1 When AT QSIMDET 1 0 is set and the tray with SIM card is removed from SIM socket the following URC will be presented CPIN NOT READY When the tray with SIM card is inserted into SIM socket again and the module finishes re initialization SIM card the following URC will be presented Call Ready The following figure is the...

Page 54: ...1_VDD SIM_GND SIM1_RST SIM1_CLK SIM1_DATA SIM1_PRESENCE 22R 22R 22R 100nF SIM_Holder GND ESDA6V8V6 33pF33pF 33pF VCC RST CLK IO VPP GND GND 33pF Figure 34 Reference Circuit for SIM1 Interface with the 6 pin SIM Card Holder The following figure is the reference design for SIM2 interface with the 6 pin SIM card holder Module SIM2_VDD SIM_GND SIM2_RST SIM2_CLK SIM2_DATA 22R 22R 22R 100nF SIM_Holder G...

Page 55: ...han 1uF and must be near to SIM cassette To avoid cross talk between SIM_DATA and SIM_CLK Keep them away with each other and shield them with surrounded ground In order to offer good ESD protection it is recommended to add TVS such as WILL http www willsemi com ESDA6V8AV6 The 22Ω resistors should be added in series between the module and the SIM card so as to suppress the EMI spurious transmission...

Page 56: ... 36 Amphenol C707 10M006 512 2 SIM Card Holder Table 14 Pin Description of Amphenol SIM Card Holder Name Pin Description SIM_VDD C1 SIM card power supply SIM_RST C2 SIM card reset SIM_CLK C3 SIM card clock GND C5 Ground VPP C6 Not connected SIM_DATA C7 SIM card data I O Quectel Confidential ...

Page 57: ...use Molex 91228 Please visit http www molex com for more information Figure 37 Molex 91228 SIM card holder Table 15 Pin Description of Molex SIM Card Holder Name Pin Description SIM_VDD C1 SIM card power supply SIM_RST C2 SIM card reset SIM_CLK C3 SIM card clock SIM_PRESENCE C4 SIM card presence detection GND C5 Ground VPP C6 Not connected Quectel Confidential ...

Page 58: ...ures and reference circuit of SD card shown in Figure 37 the users can easily design the SD card application circuit to enhance the memory capacity of the module The module can record and store the audio files to the SD card and play the audio files from SD card as well Table 16 Pin Definition of the SD Card Interface The reference design for Mirco SD card is shown as below SIM_DATA C7 SIM card da...

Page 59: ..._EXT 33R 33R 33R SD Socket 1 2 3 4 5 6 7 8 9 Figure 38 Reference Circuit for Micro SD Card Table 17 Pin Definition for SD MMC Pin NO Pin name SD Mini SD Micro SD TF MMC 7 PINs 1 CD DATA3 CD DATA3 DATA2 REC 2 CMD CMD CD DATA3 CMD 3 VSS1 VSS1 CMD VSS1 4 VCC VCC VCC VCC 5 CLK CLK CLK CLK 6 VSS2 VSS2 VSS VSS2 7 DATA0 DATA0 DATA0 DAT 8 DATA1 DATA1 DATA1 9 DATA2 DATA2 10 NC Quectel Confidential ...

Page 60: ... 3 11 PCM Interface M85 supports PCM interface It is used for digital audio transmission between the module and the device This interface is composed of PCM_CLK PCM_SYNC PCM_IN and PCM_OUT signal lines Pulse code modulation PCM is a converter that changes the consecutive analog audio signal to discrete digital signal The whole procedure of Pulse code modulation contains sampling quantizing and enc...

Page 61: ...sion mode the high three bits of 16 bits are sign extension and in the Zero padding mode the low three bits of 16 bits are zero padding 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 PCM_CLK PCM_SYN C PCM_OUT PCM_IN MSB MSB Sign extension Sign extension Figure 39 Long Synchronization Sign Extension Diagram PCM Line interface Format Linear Data length Linear 13 bits Sample rate 8KH...

Page 62: ...Synchronization Zero Padding Diagram PCM_CLK PCM_SYN C PCM_OUT PCM_IN 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 MSB MSB Sign extension Sign extension Figure 41 Short synchronization Sign Extension Diagram PCM_CLK PCM_SYN C PCM_OUT PCM_IN 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 1 2 1 1 1 0 9 8 7 6 5 4 3 2 1 0 MSB MSB Zero padding Zero padding Figure 42 Short Synchronization Zero Paddi...

Page 63: ... 4 AT Command There are two AT commands about the configuration of PCM are listed as below AT QPCMON can configure operating mode of PCM AT QPCMON mode Sync_Type Sync_Length SignExtension MSBFirst Table 20 QPCMON Command Description Parameter scope Description Mode 0 2 0 Close PCM 1 Open PCM 2 Open PCM when audio talk is set up Sync_Type 0 1 0 Short synchronization 1 Long synchronization Sync_Leng...

Page 64: ... applied on ADC0 pin For details of this AT command please refer to the document 1 In order to improve the accuracy of ADC the layout of ADC should be surrounded by ground Table 22 Pin Definition of the ADC Table 23 Characteristics of the ADC Parameter scope Description vol_pcm_in 0 32767 Set the input volume vol_pcm_out 0 32767 Set the output volume The voice may be distorted when this value exce...

Page 65: ...o hang up the call RI changes to HIGH 3 Calling part hangs up RI changes to HIGH first and changes to LOW for 120ms indicating NO CARRIER as an URC then changes to HIGH again 4 Change to HIGH when SMS is received Datacall Change to LOW then 1 Change to HIGH when data connection is established 2 Use ATH to hang up the data calling RI changes to HIGH 3 Calling part hangs up RI changes to HIGH first ...

Page 66: ...alling establish SMSreceived HIGH LOW On hook by ATH Figure 45 RI Behavior of Data Calling as a Receiver RI Idle Calling On hook Talking HIGH LOW Idle Figure 46 RI Behavior as a Caller RI Idle or Talking URC or SMS received HIGH LOW 120ms Figure 47 RI Behavior of URC or SMS Received Quectel Confidential ...

Page 67: ...gn for NETLIGHT 3 15 Operating Status Indication The STATUS pin is set as an output pin and can be used to judge whether or not module is power on In the design this pin can be connected to a GPIO of DTE or be used to drive an LED in order to judge the module s operation status A reference circuit is shown in below State Module function Off The module is not running 64ms On 800ms Off The module is...

Page 68: ...5_Hardware_Design Confidential Released 67 92 Table 26 Pin Definition of the STATUS Module 300R 4 7K 47K VBAT STATUS Figure 49 Reference Design for STATUS Name Pin Description STATUS 16 Indicate module operating status Quectel Confidential ...

Page 69: ...e RF interface has an impedance of 50Ω Table 27 Pin Definition of the RF_ANT 4 1 RF Reference Design The reference design for RF is shown as below Module RF_ANT 0R NM NM Figure 50 Reference Design for RF Name Pin Description GND 61 Ground GND 62 Ground RF_ANT 63 RF antenna pad GND 64 Ground GND 65 Ground GND 66 Ground Quectel Confidential ...

Page 70: ...n the RF trace and RF cable take design into account carefully It is recommended that the insertion loss should meet the following requirements GSM850 EGSM900 is 1dB DCS1800 PCS1900 is 1 5dB 4 2 RF Output Power Table 28 The Module Conducted RF Output Power In GPRS 4 slots TX mode the max output power is reduced by 2 5dB This design conforms to the GSM specification as described in section 13 16 of...

Page 71: ...RF pad of module correctly will reduce the loss on the path of RF please refer to the following example of RF soldering Figure 51 RF Soldering Sample DCS1800 108 5dBm PCS1900 108 5dBm Frequency Receive Transmit ARFCH GSM850 869 894MHz 824 849MHz 128 251 EGSM900 925 960MHz 880 915MHz 0 124 975 1023 DCS1800 1805 1880MHz 1710 1785MHz 512 885 PCS1900 1930 1990MHz 1850 1910MHz 512 810 Quectel Confident...

Page 72: ...te Maximum Ratings 5 2 Operating Temperature The operating temperature is listed in the following table Table 32 Operating Temperature Parameter Min Max Unit VBAT 0 3 4 73 V Peak current of power supply 0 2 A RMS current of power supply during one TDMA frame 0 0 7 A Voltage at digital pins 0 3 3 3 V Voltage at analog pins 0 3 3 0 V Voltage at digital analog pins in power down mode 0 25 0 25 V Para...

Page 73: ... stay within the min max values including voltage drop ripple and spikes 3 3 4 0 4 6 V Voltage drop during transmitting burst Maximum power control level on GSM850 and GSM900 400 mV Voltage ripple Maximum power control level on GSM850 and GSM900 f 200kHz f 200kHz 50 2 mV mV IVBAT Average supply current Power down mode SLEEP mode DRX 5 30 1 3 uA mA Minimum functionality mode AT CFUN 0 IDLE mode SLE...

Page 74: ... DATA mode GPRS 4 Rx 1Tx GSM850 EGSM 9001 DCS1800 PCS19002 265 240 200 212 mA mA DATA mode GPRS 1Rx 4Tx GSM850 EGSM 9001 DCS1800 PCS19002 615 560 420 470 mA mA Peak supply current during transmission slot Maximum power control level on GSM850 and GSM900 1 6 1 8 A Condition Current Consumption Voice Call GSM850 power level 5 300mA Typical 209mA power level 12 Typical 96mA power level 19 Typical 73m...

Page 75: ...92mA power level 7 Typical 82mA power level 15 Typical 66mA DATA mode GPRS 3 Rx 2 Tx CLASS 12 GSM850 power level 5 550mA Typical 435mA power level 12 Typical 158mA power level 19 Typical 99mA EGSM 900 power level 5 550mA Typical 400mA power level 12 Typical 150mA power level 19 Typical 97mA DCS 1800 power level 0 450mA Typical 313mA power level 7 Typical 130mA power level 15 Typical 92mA PCS 1900 ...

Page 76: ...A EGSM 900 power level 5 350mA Typical 240mA power level 12 Typical 115mA power level 19 Typical 90mA DCS 1800 power level 0 300mA Typical 200mA power level 7 Typical 107mA power level 15 Typical 89mA PCS 1900 power level 0 300mA Typical 212mA power level 7 Typical 118mA power level 15 Typical 90mA DATA mode GPRS 1 Rx 4 Tx CLASS 12 GSM850 power level 5 660mA Typical 615mA power level 12 Typical 23...

Page 77: ...procedures must be applied throughout the processing handling and operation of any applications using the module The measured ESD values of module are shown as the following table The ESD endurance Temperature 25 Humidity 45 Table 35 The ESD Endurance Temperature 25 Humidity 45 Tested Point Contact Discharge Air Discharge VBAT GND 5KV 10KV RF_ANT 5KV 10KV PWRKEY STATUS 2KV 4KV SIM_VDD SIM_DATA SIM...

Page 78: ..._Hardware_Design Confidential Released 77 92 6 Mechanical Dimensions This chapter describes the mechanical dimensions of the module 6 1 Mechanical Dimensions Of Module Figure 52 M85 Module Top and Side Dimensions Unit mm Quectel Confidential ...

Page 79: ...GSM GPRS Module M85 Hardware Design M85_Hardware_Design Confidential Released 78 92 Figure 53 M85 Module Bottom Dimensions Unit mm Figure 54 The PAD Dimensions Unit mm Quectel Confidential ...

Page 80: ...are Design M85_Hardware_Design Confidential Released 79 92 6 2 Recommended Footprint Figure 55 Recommended Footprint Unit mm The module should keep about 3mm away from other components in the host PCB NOTE Quectel Confidential ...

Page 81: ...e M85 Hardware Design M85_Hardware_Design Confidential Released 80 92 6 3 Top View of the Module Figure 56 Top View of the Module 6 4 Bottom View of the Module Figure 57 Bottom View of the Module Quectel Confidential ...

Page 82: ...30 temperature and 60 RH Stored at 10 RH Devices require baking before mounting if any circumstance below occurs When the ambient temperature is 23 5 humidity indication card shows the humidity is 10 before opening the vacuum sealed bag If ambient temperature is 30 and the humidity is 60 the devices have not been mounted during 72hours Stored at 10 RH If baking is required devices should be baked ...

Page 83: ...pads should be 0 2 mm for M85 For more details please refer to document 13 It is suggested that peak reflow temperature is from 235 º C to 245º C for SnAg3 0Cu0 5 alloy Absolute max reflow temperature is 260º C To avoid damage to the module when it was repeatedly heated it is suggested that the module should be mounted after the first panel has been reflowed The following picture is the actual dia...

Page 84: ...l is 330mm in diameter and each reel contains 250pcs modules This is especially suitable for the M85 according to SMT assembly processes requirements The tape is packed in a vacuum sealed bag which is ESD protected Furthermore it should not be opened until the devices are ready to be soldered onto the application Direction of SMT Quectel Confidential ...

Page 85: ...GSM GPRS Module M85 Hardware Design M85_Hardware_Design Confidential Released 84 92 DC圆盘44 PS 6 DETAIL A DETAIL A Figure 59 Tape and Reel Information Quectel Confidential ...

Page 86: ...nd Cell Broadcast Service CBS 6 GSM 11 14 Digital cellular telecommunications Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity module Mobile Equipment SIM ME interface 7 GSM 11 11 Digital cellular telecommunications Phase 2 Specification of the Subscriber Identity module Mobile Equipment SIM ME interface 8 GSM 03 38 Digital cellular telecommunications Phase 2 Alphab...

Page 87: ...on CHAP Challenge Handshake Authentication Protocol CS Coding Scheme CSD Circuit Switched Data CTS Clear To Send DAC Digital to Analog Converter DRX Discontinuous Reception DSP Digital Signal Processor DCE Data Communications Equipment typically module DTE Data Terminal Equipment typically computer external controller DTR Data Terminal Ready DTX Discontinuous Transmission EFR Enhanced Full Rate EG...

Page 88: ...W Gross Weight HR Half Rate I O Input Output IC Integrated Circuit IMEI International Mobile Equipment Identity Imax Maximum Load Current Inorm Normal Current kbps Kilo Bits Per Second LED Light Emitting Diode Li Ion Lithium Ion MO Mobile Originated MOQ Minimum Order Quantity MP Manufacture Product MS Mobile Station GSM engine MT Mobile Terminated N W Net Weight PAP Password Authentication Protoco...

Page 89: ...ART Universal Asynchronous Receiver Transmitter URC Unsolicited Result Code USSD Unstructured Supplementary Service Data VSWR Voltage Standing Wave Ratio Vmax Maximum Voltage Value Vnorm Normal Voltage Value Vmin Minimum Voltage Value VIHmax Maximum Input High Level Voltage Value VIHmin Minimum Input High Level Voltage Value VILmax Maximum Input Low Level Voltage Value VILmin Minimum Input Low Lev...

Page 90: ...Output Low Level Voltage Value VOLmin Minimum Output Low Level Voltage Value Phonebook Abbreviations LD SIM Last Dialing phonebook list of numbers most recently dialed MC Mobile Equipment list of unanswered MT Calls missed calls ON SIM or ME Own Numbers MSISDNs list RC Mobile Equipment list of Received Calls SM SIM phonebook Quectel Confidential ...

Page 91: ...emes Scheme Code rate USF Pre co ded USF Radio Block excl USF and BCS BCS Tail Coded bits Punctu red bits Data rate Kb s CS 1 1 2 3 3 181 40 4 456 0 9 05 CS 2 2 3 3 6 268 16 4 588 132 13 4 CS 3 3 4 3 6 312 16 4 676 220 15 6 CS 4 1 3 12 428 16 456 21 4 Radio block structure of CS 1 CS 2 and CS 3 is shown as the figure below Figure 60 Radio block structure of CS 1 CS 2 and CS 3 Rate 1 2 convolutiona...

Page 92: ... Design M85_Hardware_Design Confidential Released 91 92 Radio block structure of CS 4 is shown as the following figure Figure 61 Radio Block Structure of CS 4 Block Code No coding 456 bits USF BCS Radio Block Quectel Confidential ...

Page 93: ...r 2 2 the first number indicates the amount of downlink timeslots while the second number indicates the amount of uplink timeslots The active slots determine the total number of slots the GPRS device can use simultaneously for both uplink and downlink communications The description of different multi slot classes is shown in the following table Table 39 GPRS Multi slot Classes Multislot Class Down...

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